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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc730d511c4e4b488d374a19253c4f1c2a23e79b660b9e9d7aedfe0f3f50773' 
  AND token = '9PCWZvWoI8IIP0LhxxiLbSSXpdYQWmf5srykVPYD0mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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