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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75de84d9f1dadf12b8e893dee19cb942f0eab3b36e62ad3c95bc92274f22e716' 
  AND token = 'h8FlTyY9cyg+wS/wM9RTLebxcxckkjMzcGUAoUINtwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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