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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889a727b1c8e82637b564ae579e085717c83596ddd0541bbd2006773e58d135c' 
  AND token = 'qLrEDoh9Im4yfWkpjcT3bvshGfB2YW0A/ZHZsACprg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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