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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed8f2453904000fc0f11154778eda58eb7c1514b029afcc018df8fe398f1af3' 
  AND token = 'NaxSrNeQIZ7Jv2cIuYt6fv6XBA/Ft0xB3TwP8/0TyHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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