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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8036899ce489e3cb4971f00ceb2600ee096e509621e51a030b6fafe01ee63687' 
  AND token = 'koUgevvV5vbsh4Inla+ZRRFsDZucne9b5pJKqdsM9ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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