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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a867283fd0c6f1f6b79d1a31fa632e25b1e8d587ed75551c43f045ea733c28cf' 
  AND token = 'kBtQ9ofpAGsYhFvroSupyt2VLt8rwT1tFWUIsWKc600=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00136

JSON explain

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