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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a20a0045a273c304fed03b9b18a15590b7bd1b44fd5aef4276935ab7605e9b8' 
  AND token = 'i1qtq8XChGrIer/4v7ItThrZJBlv8ns94YueFtZUs/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}