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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4ae701404a2e297c39e1d57e59dc606cfc7748e37728ccdb639c3711552310' 
  AND token = 'QVvb8fO1dHh3MRppNpzmRVcLQzdpydMVbg4TYlC7zHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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