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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d01e7effe83dc20d90ca02705d0fba01868292eff864288aa94a44d502d028' 
  AND token = 'YzbWoIHCpjT8WI12Uu6crfh74UUJiqsiNZz2C3t38ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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