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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8b3ba5decc53f1cca5465e17e66bca8e73b35f1d39ac4ae049a528e87a0f31' 
  AND token = '6JOSbtQ40HOxteITkJbUDWUZ/nkXpgW3+MnqXYFND2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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