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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3056e1d932922a092689b6e3eba9b8a67d69c7bf44d22b001c428dcbb4c3c5' 
  AND token = 'dy0oUHSEaoW3lO707vMtGUV9X5nJXhv1D1L95E79488=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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