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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd58029f02a768c336786469c4077cffd8173ed09579ecca1cf74e326893967' 
  AND token = 'giIyNBAqFW0kIjJr1yBiXYXsOhkaI7X6sjHwHxWzlWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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