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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0d2444859dc1bd6f8400a57f090bed9ccdce25782354280b51d1064867d182' 
  AND token = 'Af1ukvE1heMWJDNKqalYfk0yE6VDR2GsGw7VKYYDMao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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