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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47a86e286cf19cde672340b622a425801d8d455449bd55a3d535c63eda5c68c' 
  AND token = 'Wdzk8+WJCFiMwdUrjat3ha4Bf44bi6As4ne5KCnieHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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