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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10d6cb690fa9cecee8ce38d8d8befdb13a8af3e7d207e1804faf75eabb7b3f6' 
  AND token = 'X9BeHiBaNwY+evaK19IMNWF0CeOxSTXaPFv8vX7Wa5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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