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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35f0426da657bb6d30ef7829eca777d6b68338a1bbd307689674ec6a11736d1' 
  AND token = '94O+I+++Qxspbp/46K1IgdJN0L3bQS8NUvjHtOVZ6E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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