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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c70e66e73e755c98d5340d95cf63eff60949746a411c3c78e8d66ac537447b' 
  AND token = '8bGDnAS51Fm3W97Rp9vyiZ9+wQled1Bg392rfyMrhlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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