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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e482fa911de7306a2736aa8470366123ad1f33ad639bc7fee577046e6ce5f3c9' 
  AND token = 'KtZF9Lc5fx6Ws8GDeLZf1Lk2clK93tRDXPLcQ0u0vec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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