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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8bb17a507cb19b3984ecd5e55cb3e007198ccd54c63ba257f72036b9ac2650' 
  AND token = '8nqcvi60EzRsjYCdRRdAo5mgyorQ/k8FBR3TyKVgBjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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