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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd99f2456c978460e0c49f890f0325d09b4bf83c92956f8c5f31ddabb8a7559' 
  AND token = 'QRUQ+vzTr2vATk+Z4is/YViLAAU0/FoPiBcMmhp45vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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