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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a123cb7860a4001264c14b9d82c1ddd0b805ceb08ca34464e91c942c7e53ef3' 
  AND token = 'ZcfMhs4HR2PDsw6+zbhG2vibbbZsCFwcikwAbq+MqGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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