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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2438eee494ae8fb2e92d0016b153c8dc59b285c37ca3d85fba6ad574e339f2b' 
  AND token = 'm//CJQJSBtrzrfW77DNy8kus5Cy4DCwkeF0OTy/SXdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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