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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059dce944a191423512bc08e1511c2bb7cb50c4accb3aa3f9123f4aa91b9e8e7' 
  AND token = 'QhIH7PkW2l57V0BxHO4remsG/vQ+Cg1vpGlArNGTO/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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