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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85618fc25fe067834b231ec6d1dd674cd4c62c57bac9b1ad394d3f9891c3b353' 
  AND token = '8dxszGMV8YumVRw9oRbGCuedfGynSu62RbmIS1aKa4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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