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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc754220d11ad5a28c25d898c749c6cfbec13369e463195be697bc491939ba5' 
  AND token = 'Lv+D9WoAn3Dtye1J4u0TzzP51P3jxYmp65Am2UCncVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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