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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbeea6d54da05185d5650b80b22fecf890539c30d9ab1b0b7d7b0ff4dcba8e1' 
  AND token = 'KsL5lHh2K9mercMelWJcA41NgHBqtu7an7TeAb+MeQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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