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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80318b2860532476682c03d25fe5f450e8d022b909617d251016ec5be287a0d' 
  AND token = 'nwB8LziA/KOV6AZaRQ8JS2Wit3X/0zxhbo9Hfuw1iFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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