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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0fe6371e0e6423e9bb5d8877a46f9129c2262008413e6c90114d5b7d3e3d2e' 
  AND token = '6Srmf3lqoxs7fiqzWLIXBkxAP11r6UE4NN75vPH4qFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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