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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30dcebfd70465a0172b18a6921487a0dd6c94ee28697e3aeb0008e7bb89e57f' 
  AND token = 'MuNanglv/tksOmlQ9fdfIHgIy/9B5Yx4vM+nbih4nvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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