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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17263ee2fdcf0ed15bed25457c848666fe1ba38f3946236b516b482b0c623c83' 
  AND token = 'LuBZZn0/z+1lHWOjZW8ceNQ9LzH2Op8P2oWsgrSPk+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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