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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89bb3003c47c4d77f090b73450ee4311884ebf86cbb5a544c23b652dfcaded52' 
  AND token = 'FB+/3qLNoSUSLx8QZw8FzU0kCz1TNfbF3FEgTaBqW/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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