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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03abddce553edf5230ae952c61f59611ce419dfe6b2a37cc1d544091262e681' 
  AND token = 'TvHAJO0g/PYpEv4QlEXZ0dB9CkR5dIhU80Bou6SdYg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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