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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615b445f11fc12639c15e8f6c2e8251e1600cf781b8ca1dc06f84c5c9aad9d2a' 
  AND token = 'IT00CPd7tJ/xh5LUyu2ccbZYvpyVMfuwKnXIk0RXbgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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