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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e293b61eb724bc3437abeb477b60840f03178519fb1eb88fd5df60b29d9bae5' 
  AND token = 'ZjClzZxfnM6b9Oz9AlZ2A3qF9dBEMM/cuExO+VBguE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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