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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687c0682bd2a8e32bd7540f375a5556b842c9efd5a4c64e578909c4c6568b823' 
  AND token = 'gPe9J82TyKYBaxnuKcySHINE/NU1aWHS1g92SHRNE44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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