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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2d997fd6d13bd21194a775a570f07eb57aa4de992a7aabf1dccd57e05f7ec7' 
  AND token = '6egDK5gkQJeVJEK7NS0EVLDyTlkwf19DgzUm4qBvUWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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