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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b986bd14f72b09b7cd70e7ba6464caa1ec4924f47a15782c2aa44d71d9cfee' 
  AND token = 'rhq6L+5H5dtwG3qf2Ub3Xnd1cbnyNqgC+BDOJ0F/9RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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