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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc3394c3b0760798de4f1a09575e01b557c2cd292c3804e8d9b01d897e47b01' 
  AND token = '+gwUuyCAT2Dqf70nNiafNQvzDN8hddWEX88DmB3kfyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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