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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79eb04ee92a0cd2fb3405d34fba98bc3a1e120e99b9d60b193eb8dc33550a779' 
  AND token = 'NLL01iGWFqZZX8JU7VdxZQ+VHB3KR1f4DE9oBS98r14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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