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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206965633396956b89391a1757e79abcb054c4af0029b84014adc6fec7da978b' 
  AND token = 'tUU3jSU4AbJ4LqHdA6lNJY6qW2qjEEgtFIdTz5x2Xvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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