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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10de520678906f6554f70a9f739716414673c8a92e30dde2e76ccb33f0893104' 
  AND token = '6CSmvhe6Ds8PxuCiUi4sTUvUrdPh67Q29n/uizRBUkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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