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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27415575af78c38d50c7c013b2b66838ff75bc9aa16894a5c98ad01cf8bacf3f' 
  AND token = 'v4PzZ9mg9tH+q9vX2sZDILecEn7kHtK4eASu7MqKZGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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