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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bd4202502c7c631fe651b9fcdb5d549fdae9c03b51d2e9dda00c1621dc1c8e' 
  AND token = '98pBtR2/eT12HgPThim+IGVYDZldvUqAo3UEvWp75Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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