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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac73bbe00645d23db45b56dc59a0e9f96eace4327f1c2252c8cedc782b498bc' 
  AND token = '7c6nBXrAlIya1xbYKWbViNzNpJq3k3VmIizbiKiNFDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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