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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31fd640b88b0f1d752a97fc854f1e16ecad634d92e296a6764bd993590a352ba' 
  AND token = 't4+V8WkB46afvKDxyw8m8wbSVHeiGZb5v8i4P6j+DOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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