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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835cc9eb90756aceb2fe5ceb054810a0881763f2beb867e05b02af8ed9de7a3d' 
  AND token = 't0VHb+xew+HLFyvnbnCqNmZHTteW+NyLNkHnMOuZUW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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