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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6341ebe49e7fe06e794ea20c3736bdc25521d9ddf2b9362aec457c1e5a869a90' 
  AND token = 'Qln+T2ljbo9LVmVP20ICKNuVMJnxn2JRQYaP+irdgw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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