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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bca224af40ad15f055a81c1a61a8ba65e886dde169687dd2ed7e27fa74b9e27' 
  AND token = 'HWMtxln5Y7gt/i5eX29eTDJedISlyHWK2NEMCCW3kHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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