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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69314c8532b08f0256cd4052b19ab89a553d021ace2448be591392e51f111583' 
  AND token = 'D3fwE1y5MTymuUppL5NWC4U93LFfbF6wAFBtzzous1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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