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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babc5b1009b2e3b07eb3958daac9054347ae444373acb1ef11f50d24d92d0b98' 
  AND token = 'mTXdE0+10FFAaY+ohlaqcp+j+k4Uo4Siv8wLwvQpCAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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