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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6195aab8c4c520b35365aadb2ede25dcf09a09c505ae489f89faef40d466b9' 
  AND token = 'Lif1f3l+h1+Hlrc0gPjsQQRa/sxxtUQVP3fKMpSMs6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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