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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282cb3e1f4fec90d1642f119c7986094fa2b0a61fd8bd1271ce2f46362dec8ef' 
  AND token = 'Hcu/3TxtS/X3xbrPYY1Famh1Bd4d0H5nd+vXskbhOBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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