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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03607026ea5cfde3f9060473bd0bf5f154414e09d80ad48b372a773288b2de8d' 
  AND token = '6PN1u42kfjJPwFa3Xa4+eLf+bPpmkHucCCZC/+WWHFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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