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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867691628979f60044d7e54a01af4beab325fd23743c28d3a0e8f70d8a6a73c0' 
  AND token = 'MxWaNCjGEayNo1KG1oF+coQlNkQymNotjH+kFXyxD/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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