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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3952fa64dec43bd9c021b8350895605518ae093fc12f3b21a6046f86727835' 
  AND token = '6XwoXtrr2p62a84xjfmspXPVAOb1ttQ+M7yEtzJZ4AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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