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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c7d956af30d069fefdbf4615d852831b224fb668b99116aaab5a9999d1c0d8' 
  AND token = 'Ce62dtHHfHTMkjJdvLS1W78dQslMaB/eBqCxCzRyvgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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