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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2235b1693b4586acf7ed82fddd29b234ae40a2c3def468d7d155c44228837a1' 
  AND token = 'icy2046rAVL2Ukd7JEJZcJv8ObnIUp5UjDYGaWnbtOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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