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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191ea19057371f71579e51a3780f97c7335d6819d34f98fe748ca5396d8ed4ce' 
  AND token = 'Hz45/8U66uTLTtpLo10CzFm+emv2ljKIZKTGzZtCOus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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